Is CVE-2023-26464 actively exploited?

Yes. CVE-2023-26464 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2023-26464 be exploited remotely?

The attack vector of CVE-2023-26464 has not been classified yet.

What is the CVSS score of CVE-2023-26464?

CVE-2023-26464 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2023-26464

UNKNOWNCISA KEVIN THE WILD

CVE-2023-26464

Published: April 11, 2026

Official Description

** UNSUPPORTED WHEN ASSIGNED **

When using the Chainsaw or SocketAppender components with Log4j 1.x on JRE less than 1.7, an attacker that manages to cause a logging entry involving a specially-crafted (ie, deeply nested)

hashmap or hashtable (depending on which logging component is in use) to be processed could exhaust the available memory in the virtual machine and achieve Denial of Service when the object is deserialized.

This issue affects Apache Log4j before 2. Affected users are recommended to update to Log4j 2.x.

NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

NVD Source

Technical Analysis

CVE-2023-26464 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2023-26464 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.